Comments on: High Speed Flash Tests http://www.photosbykev.com/wordpress/2008/06/25/high-speed-flash/ Wildlife and Nature Photography by Kevin Lewis Mon, 30 Jan 2012 05:11:53 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Bill http://www.photosbykev.com/wordpress/2008/06/25/high-speed-flash/#comment-17707 Bill Thu, 26 Jan 2012 12:42:01 +0000 http://www.photosbykev.com/wordpress/?p=112#comment-17707 I never saw ghosts when using RF triggers exclusively, but my hummer photos were often haunted when using optical slaves. This may be the clue I overlooked. The backlight flash is on an optical trigger. Some of that light may be striking the subject causing my ghosts. I believe some, if not all, optical slaves have very slight reaction times. Thanks for the prompt reply. It's helpful knowing that differing power levels is not the culprit. I never saw ghosts when using RF triggers exclusively, but my hummer photos were often haunted when using optical slaves. This may be the clue I overlooked. The backlight flash is on an optical trigger. Some of that light may be striking the subject causing my ghosts. I believe some, if not all, optical slaves have very slight reaction times. Thanks for the prompt reply. It’s helpful knowing that differing power levels is not the culprit.

]]> By: photosbykev http://www.photosbykev.com/wordpress/2008/06/25/high-speed-flash/#comment-17673 photosbykev Wed, 25 Jan 2012 19:54:45 +0000 http://www.photosbykev.com/wordpress/?p=112#comment-17673 The only time I've had ghost images was when I was shooting with the flashguns connected wirelessly, I figured there was a small but noticable timing issue causing the problem. When I hard wired the flashguns together the problem disappeared even when the guns were being set at differing power levels, say one at 1/128 and a pair at 1/64 of full power. The only time I’ve had ghost images was when I was shooting with the flashguns connected wirelessly, I figured there was a small but noticable timing issue causing the problem. When I hard wired the flashguns together the problem disappeared even when the guns were being set at differing power levels, say one at 1/128 and a pair at 1/64 of full power.

]]> By: Bill http://www.photosbykev.com/wordpress/2008/06/25/high-speed-flash/#comment-17665 Bill Wed, 25 Jan 2012 15:53:08 +0000 http://www.photosbykev.com/wordpress/?p=112#comment-17665 Kev, I ran across your site while searching for flash durations for the Canon 580EX II. This is pretty neat stuff on your site. I'm using two Sunpak 383 flashes, one Canon 580EX II and one Vivitar 283 to shoot hummingbirds on the wing. The Canon and Sunpaks are fired by RF triggers while the Vivitar (used as backdrop light only) is on an optical slave. Of course the Canon and Sunpak flashes have different power ratings, so I was caught between matching the exposures of the Canon to the Sunpak, and matching the flash durations. Because it was easier, I matched the exposure. I'm seeing some ghost effects in my photos. So I decided to match the flash durations among the flashes, which means, at the same flash duration the Canon emits a great deal more light than the Sunpaks. My next attempt will be to move the Canon flash a little farther back than the Sunpaks, or set a wider angle on the Canon flash. Maybe use diffusion. Other than springing for a couple more Canon flashes, do you have any thoughts on this? It's raining today, so I'm just mulling over my options. Kev, I ran across your site while searching for flash durations for the Canon 580EX II. This is pretty neat stuff on your site.

I’m using two Sunpak 383 flashes, one Canon 580EX II and one Vivitar 283 to shoot hummingbirds on the wing. The Canon and Sunpaks are fired by RF triggers while the Vivitar (used as backdrop light only) is on an optical slave. Of course the Canon and Sunpak flashes have different power ratings, so I was caught between matching the exposures of the Canon to the Sunpak, and matching the flash durations. Because it was easier, I matched the exposure. I’m seeing some ghost effects in my photos. So I decided to match the flash durations among the flashes, which means, at the same flash duration the Canon emits a great deal more light than the Sunpaks. My next attempt will be to move the Canon flash a little farther back than the Sunpaks, or set a wider angle on the Canon flash. Maybe use diffusion. Other than springing for a couple more Canon flashes, do you have any thoughts on this? It’s raining today, so I’m just mulling over my options.

]]> By: Freezing liquid drops with a flash, Nov 21 2011 | Leif Norman: http://www.photosbykev.com/wordpress/2008/06/25/high-speed-flash/#comment-15130 Freezing liquid drops with a flash, Nov 21 2011 | Leif Norman: Tue, 22 Nov 2011 05:48:14 +0000 http://www.photosbykev.com/wordpress/?p=112#comment-15130 [...] Here are some good high speed shots by Kev: http://www.photosbykev.com/wordpress/2008/06/25/high-speed-flash/ [...] [...] Here are some good high speed shots by Kev: http://www.photosbykev.com/wordpress/2008/06/25/high-speed-flash/ [...]

]]> By: photosbykev http://www.photosbykev.com/wordpress/2008/06/25/high-speed-flash/#comment-5370 photosbykev Wed, 06 Oct 2010 07:11:14 +0000 http://www.photosbykev.com/wordpress/?p=112#comment-5370 they were all shot with a long shutter speed between 1 and 2 seconds in a darkened room they were all shot with a long shutter speed between 1 and 2 seconds in a darkened room

]]> By: hilary http://www.photosbykev.com/wordpress/2008/06/25/high-speed-flash/#comment-5369 hilary Wed, 06 Oct 2010 06:09:52 +0000 http://www.photosbykev.com/wordpress/?p=112#comment-5369 what was the shutter speed ? what was the shutter speed ?

]]> By: Anonymous http://www.photosbykev.com/wordpress/2008/06/25/high-speed-flash/#comment-5225 Anonymous Thu, 30 Sep 2010 14:29:07 +0000 http://www.photosbykev.com/wordpress/?p=112#comment-5225 [...] [...] [...] [...]

]]> By: Richard D. Cox http://www.photosbykev.com/wordpress/2008/06/25/high-speed-flash/#comment-158 Richard D. Cox Wed, 29 Oct 2008 22:15:07 +0000 http://www.photosbykev.com/wordpress/?p=112#comment-158 Could you tell me how you connect the Time Machine to the 40D? Which cable is required? Thanks. Could you tell me how you connect the Time Machine to the 40D? Which cable is required? Thanks.

]]> By: Kevin Lewis http://www.photosbykev.com/wordpress/2008/06/25/high-speed-flash/#comment-63 Kevin Lewis Sun, 17 Aug 2008 08:39:19 +0000 http://www.photosbykev.com/wordpress/?p=112#comment-63 Thank you for the input Tom :) The second gun is being fired via the master/slave wireless link which will put some delay into the triggering. I'll be modding the system so both guns are triggered via a wire to see if the timing improves. Thank you for the input Tom :) The second gun is being fired via the master/slave wireless link which will put some delay into the triggering. I’ll be modding the system so both guns are triggered via a wire to see if the timing improves.

]]> By: tom brown http://www.photosbykev.com/wordpress/2008/06/25/high-speed-flash/#comment-62 tom brown Sun, 17 Aug 2008 07:02:33 +0000 http://www.photosbykev.com/wordpress/?p=112#comment-62 (sorry, 30us (microsecnds), not 30 ns. (sorry, 30us (microsecnds), not 30 ns.

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